Re: [PATCH] x86: mtrr cleanup for converting continuous todiscrete layout v2

[Ingo Molnar]

* Yinghai Lu <yhlu.kernel.send@xxxxxxxxx> wrote:

> some BIOS like to use continus MTRR layout, and X driver can not add 
> WB entries for graphical cards when 4g or more RAM installed.
> 
> the patch will change MTRR to discrete.
> 
> mtrr_chunk_size= could be used to have smaller continuous block to 
> hold holes. default is 256m, could be set according to size of 
> graphics card memory.

hm.

> +static int disable_mtrr_cleanup;

i think this should be default-disabled. Touching MTRRs on a live system 
could interact with SMM and MCE handlers.

how relevant is this feature with modern Xorg? I thought modern Xorg 
would get its mappings via /sys, hence it would not have to touch MTRRs 
at all.

	Ingo
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